CN102437865B - Method for improving frequency domain anti-interference performance of direct-spread/frequency-hopping mixed spread frequency system - Google Patents
Method for improving frequency domain anti-interference performance of direct-spread/frequency-hopping mixed spread frequency system Download PDFInfo
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Abstract
The invention provides a method for improving the frequency domain anti-interference performance of a direct-spread/frequency-hopping mixed spread frequency system and aims to solve the problems of influence on the anti-interference performance caused by discontinuous phase and poor suppression performance of a fast time-varying interference signal. The method is implemented by adopting the technical scheme that: a distance measurement and speed measurement receiver having a frequency domain anti-interference function consists of a de-hopping module, a band-pass filter, a frequency domain anti-interference module, a demodulation module, a de-spreading module and a distance measurement and speed measurement module, which are sequentially connected on the same line in series, a frequency-hopping tracking module which is bridged on the de-hopping module and the frequency domain anti-interference module in parallel, and a carrier and code tracking module which is bridged on the demodulation module and the de-spreading module in parallel; and the frequency domain anti-interference module is divided into a windowing sub-module which is in frequency-hopping synchronization with the frequency-hopping tracking module, a fast Fourier transformation (FFT) sub-module, an interference suppression processing sub-module and an inverse FFT (IFFT) sub-module. The method is applicable to suppression of a narrow-band interference signal.
Description
Technical field
The present invention relates to a kind of digital baseband equipment that is mainly used in space flight measurement and control, satellite navigation receiving system, be applicable to the method for the inhibition narrow-band interference signal of straight expansion frequency hopping hybrid spread spectrum system.
Background technology
There are two in the prior art DS/FH hybrid spread spectrum system and disturb a difficult problem that suppresses; First is that directly to expand frequency hopping hybrid spread spectrum system signal carrier phase discontinuous, and second difficult problem is that directly to expand become dry when the quick interference rejection of disturbing signal of frequency hopping hybrid spread spectrum system not good.The reason that first problem produces is directly to expand the carrier frequency of frequency hopping hybrid spread spectrum signal according to the continuous saltus step of frequency hopping pattern; Need take wideer radio frequency bandwidth; And the radio equipment (going up low-converter, filter etc.) and the radio transmission link (mainly being ionosphere) that directly expand frequency hopping hybrid spread spectrum receiving system are difficult to guarantee linear transmission under broadband condition; Cause directly expanding frequency hopping hybrid spread spectrum signal generation group delay distortion, group delay distortion makes carrier phase no longer continuous; Secondly the very wide common generation of a plurality of digital direct frequency synthesizers of signal demand (DDS) of frequency hopping bandwidth; Single DDS works alone; Only be responsible for generating the Frequency Hopping Signal in certain band segment, a plurality of DDS produce the wide interval frequency hopping signal jointly, and different DDS will cause carrier phase discontinuous when switching.When carrier phase occurs when discontinuous; According to the frequency domain Anti-Jamming Technique of existing optional position windowing, if comprised the carrier phase discrete date, after FFT conversion (fast Fourier transform) submodule is done the FFT conversion by the data segment of windowing; A lot of mixed and disorderly line spectrums can appear on the frequency domain; Thereby these line spectrums all will be disturbed the inhibition processing sub to judge into interference signal by accident and are suppressed, and cause Signal-to-Noise to reduce, and have influenced jamproof performance.
Second difficult problem is the time variation of interference signal in the DS/FH hybrid spread spectrum system; Because the straight frequency hopping hybrid spread spectrum signal(-) carrier frequency that expands is according to the continuous saltus step of frequency hopping pattern; Each frequency hopping dot frequency is different in the frequency hopping pattern; The interference signal that causes the hybrid spread spectrum signal to face at different frequency hopping points place is also different, so on time domain, see change when interference signal is, the every generation of signal interference signal when jumping changes once.According to the anti-interference algorithm of the frequency domain of existing application in directly-enlarging system; Obtain the decision gate limit value of interference signal through adaptive filter method, the power that surpasses the decision gate limit value is considered to narrow band interference and suppresses, and the sef-adapting filter in the existing anti-interference algorithm of frequency domain needs certain convergence time; When convergence time greater than frequency hopping pattern in during the residence time of single-hop; The decision gate limit value of interference signal does not also correctly ask when calculating interference signal just to change, and the interference signal decision gate limit value that causes obtaining is incorrect, if threshold value is less than normal; Then there are some signals to be judged into by accident interference and be suppressed; Cause the snr loss,, interference signal is not had the inhibition effect again if threshold value is bigger than normal.
Summary of the invention
The objective of the invention is to use the weak point that exists straight the expansion in the frequency hopping hybrid spread spectrum system to prior art; Provide a kind of through frequency hopping tracking module assist in synchronization windowing module with rationally choose the window function size; Utilize mean value method to obtain thresholding; Solve the discontinuous interference free performance that influences of phase place, solving becomes dry when quick disturbs the signal suppressing poor performance, improves the straight method that expands frequency hopping hybrid spread spectrum system frequency domain interference free performance.
The present invention solves the scheme that the prior art problem adopted: a kind of method that improves straight expansion frequency hopping hybrid spread spectrum system frequency domain interference free performance is characterized in that comprising the steps:
At first separate mode hopping piece, band pass filter, frequency domain immunity module, demodulation module, despreading module, ranging and range rate module on the same circuit by being connected on successively; Cross-over connection is connected in parallel on carrier wave and the code tracking module that the frequency hopping tracking module separated on mode hopping piece, the frequency domain immunity module and cross-over connection be connected in parallel on demodulation module, despreading module and forms the ranging and range rate receiver with frequency domain anti-interference function; Secondly in above-mentioned frequency domain immunity module, divide further: suppress processing sub and IFFT transformation submodule with windowing submodule, FFT transformation submodule, the interference of frequency hopping tracking module frequency hopping synchronization; Wherein, The auxiliary frequently synchronous windowing submodule of frequency hopping tracking module carries out windowing to input signal; The local Frequency Hopping Signal that the frequency hopping tracking module produces is separated jumping through separating the mode hopping piece to the straight expansion frequency hopping and the hybrid spread spectrum intermediate-freuqncy signal of input; Send into band-pass filter; Suppressed to handle interference signal by the frequency domain immunity module again, the interference signal after the inhibition is given the ranging and range rate module again after demodulation module and despreading module.
The auxiliary frequency hopping synchronization windowing submodule of frequency hopping tracking module of the present invention carries out windowing to input signal: choose frequency hopping and carry out windowing along one piece of data afterwards, avoid window function and be added in the discontinuous data segment of carrier phase; Signal after the windowing transforms to frequency domain through the FFT transformation submodule; Again through disturb suppressing processing sub the computing of averaging of N energy values of each Frequency point signal of representative of FFT transformation submodule output; Average multiply by a coefficient θ again and obtains threshold value; Is the Frequency point energy value inhibition greater than the threshold value place in this N energy value zero; Signal after interference signal suppressed to handle is remapped through the IFFT transformation submodule on the time domain, obtains the output signal of frequency domain immunity module, gives the ranging and range rate module output signal of frequency domain immunity module through demodulation module and despreading module again and improves the frequency domain interference free performance.
The present invention has following beneficial effect than prior art:
The present invention utilizes the frequency hopping synchronization module to assist the frequency domain immunity module; Choose frequency hopping and carry out windowing along one piece of data afterwards; Avoiding window function is added in and has crossed over the one piece of data of frequency hopping along front and back; Combine rationally to choose the size of window function again; The positive integer of choosing window function size doubly is the number of sampled data in the single-hop residence time, thoroughly to avoid crossing over the discontinuous data segment of phase place, has solved the discontinuous problem that causes the frequency domain interference free performance to worsen of carrier phase in the straight expansion frequency hopping hybrid spread spectrum system; Again through utilizing mean value method to obtain the interference threshold value, realize becoming dry when quick and disturb effective inhibition of signal, become dry when having improved in the straight expansion frequency hopping hybrid spread spectrum system fast and disturb the rejection of signal.
The present invention is specially adapted to directly to expand the inhibition of the narrow-band interference signal of frequency hopping hybrid spread spectrum system.
Description of drawings
Below in conjunction with accompanying drawing and embodiment this patent is further specified.
Fig. 1 directly expands the receiver principle block diagram that frequency hopping hybrid spread spectrum system has the frequency domain anti-interference function.
Fig. 2 is the inner submodule division principle of a Fig. 1 frequency domain immunity module block diagram.
Embodiment
Consult Fig. 1.In the most preferred embodiment of the present invention of following description; Be used for directly expanding the ranging and range rate receiver with frequency domain anti-interference function of frequency hopping hybrid spread spectrum system; Separate mode hopping piece, band pass filter, frequency domain immunity module, demodulation module, despreading module, ranging and range rate module by being connected on the same circuit successively; Cross-over connection is connected in parallel on carrier wave and the code tracking module that the frequency hopping tracking module separated on mode hopping piece, the frequency domain immunity module and cross-over connection are connected in parallel on demodulation module, despreading module, and totally eight parts constitute.Wherein, The auxiliary frequently synchronous windowing submodule of frequency hopping tracking module carries out windowing to input signal; The local Frequency Hopping Signal that the frequency hopping tracking module produces is separated jumping through separating the mode hopping piece to the straight expansion frequency hopping and the hybrid spread spectrum intermediate-freuqncy signal of input; Send into band-pass filter, suppressed to handle interference signal by the frequency domain immunity module again, the interference signal after the inhibition is given the ranging and range rate module again after demodulation module and despreading module.
Consulting Fig. 2. Fig. 2 has done further submodule to the frequency domain immunity module among Fig. 1 and has divided; The frequency domain immunity module suppresses processing sub by synchronous windowing submodule, FFT transformation submodule, interference and the IFFT transformation submodule is formed, and wherein the windowing submodule is assisted by the frequency hopping tracking module synchronously.
In the hybrid spread spectrum receiver, the frequency hopping tracking module produces the local Frequency Hopping Signal with the input signal synchronising frequency hopping, and the local Frequency Hopping Signal of generation is separated jumping through separating the mode hopping piece to the straight expansion frequency hopping hybrid spread spectrum intermediate-freuqncy signal of input; After separating the mode hopping piece, the signal after separating jumping is carried out filtering through band pass filter, wideer hybrid spread spectrum signal bandwidth filtering on the bandwidth of having only direct sequence signal; Signal at first carries out the windowing computing through the frequency hopping synchronization windowing submodule in the frequency domain immunity module after the filtering; By the frequency hopping tracking module auxiliary choose frequency hopping along after one piece of data carry out windowing, avoid window function and be added in and crossed over the one piece of data of frequency hopping along front and back.Window function can be selected hamming window (publishing house of Tsing-Hua University, Cheng Peiqing, < Digital Signal Processing study course>199 pages) for use, and window width is chosen for N=Th * Fs/K, and the K here is a natural number, and Th is the residence time of single-hop in the frequency hopping pattern, and Fs is the AD sample rate of receiver.Signal after the windowing transforms to frequency domain through the FFT transformation submodule; Through disturb suppressing processing sub interference signal is suppressed to handle again: the computing of averaging of N energy values of each Frequency point signal of representative of FFT transformation submodule output; Average multiply by a coefficient θ again and obtains threshold value, is the Frequency point energy value inhibition greater than the threshold value place in this N energy value zero; Signal after the inhibition is remapped through the IFFT transformation submodule on the time domain, just obtains the output signal of frequency domain immunity module; After demodulation module and despreading module, give the ranging and range rate module again, improve the straight frequency domain interference free performance that expands frequency hopping hybrid spread spectrum system effectively.
Expand in the frequency hopping hybrid spread spectrum system straight; The frequency hopping rate that present embodiment is jumped with per second 10000; The straight extended code rate of per second 5,000,000 chips; The AD sampling clock of the receiver of 60 megahertzes is an example, further specifies the concrete performing step that the present invention improves straight expansion frequency hopping hybrid spread spectrum system frequency domain interference free performance:
(1) separate jumping: the Frequency Hopping Signal of the identical frequency hopping pattern that the local generation of hybrid spread spectrum receiver is synchronous and input signal multiply each other and realize separating jumping;
(2) filtering: after separating the mode hopping piece, through band pass filter the signal after separating jumping is carried out filtering, band pass filter is chosen the intermediate-frequency filter of 10 megahertz bandwidth;
(3) windowing: signal carries out the windowing computing through the frequency hopping synchronization windowing submodule in the frequency domain immunity module after the filtering; Window function is selected the hamming window for use, adds window position by auxiliary the choosing of frequency hopping tracking module: finish to the 600th data sample point along beginning from frequency hopping;
(4) FFT conversion: it is 600 fast Fourier transform that the signal of FFT transformation submodule after to windowing done sequence length, is sequence length after the windowing that to be transformed into sequence length be 600 frequency-region signal for 600 time-domain signal;
(5) disturb to suppress: disturb that to suppress processing sub be that 600 frequency-region signal is averaged to sequence length after the FFT conversion at first; Carrying out determining interference again handles: being judged to into greater than the frequency-region signal of 2 times of mean values that interference signal suppresses is zero, and the numerical value that is not more than 2 times of mean values is judged to signal and does not deal with;
(6) IFFT conversion: the IFFT transformation submodule to disturb to suppress handle the back sequence length be 600 frequency-region signal to do sequence length be 600 Fast Fourier Transform Inverse, obtain accomplishing the time-domain signal after the time domain anti-interference process after the conversion;
(7) demodulation despreading ranging and range rate: follow-up processing is the same with general straight expansion band spread receiver; Receiver is local to be produced the time-domain signal of carrier signal after to anti-interference process and carries out demodulation; Receiver is local to be produced the signal of synchronous spread spectrum code sequence after to demodulation and carries out despreading; Track loop extraction in carrier wave and code tracking module obtains carrier doppler and code phase, it is carried out conversion Calculation try to achieve speed and distance, and this has just realized ranging and range rate.
Claims (3)
1. one kind is improved the straight method that expands frequency hopping hybrid spread spectrum system frequency domain interference free performance; It is characterized in that comprising the steps: at first; Separate mode hopping piece, band pass filter, frequency domain immunity module, demodulation module, despreading module, ranging and range rate module, cross-over connection by being connected on successively on the same circuit are connected in parallel on the frequency hopping tracking module and the cross-over connection of separating on mode hopping piece and the frequency domain immunity module and are connected in parallel on carrier wave and code tracking module on demodulation module and the despreading module, form a ranging and range rate receiver with frequency domain anti-interference function; Secondly; Above-mentioned frequency domain immunity module further suppresses processing sub by frequency hopping synchronization windowing submodule, FFT transformation submodule, interference and the IFFT transformation submodule is formed; Wherein, Frequency hopping synchronization windowing submodule is assisted by the frequency hopping tracking module, and the frequency hopping tracking module produces the local Frequency Hopping Signal with the input signal synchronising frequency hopping, and the local Frequency Hopping Signal of generation is separated jumping through separating the mode hopping piece to the straight expansion frequency hopping hybrid spread spectrum intermediate-freuqncy signal of input; After separating the mode hopping piece, the signal after separating jumping is carried out filtering through band pass filter, wideer hybrid spread spectrum signal filtering on the bandwidth of having only direct sequence signal; Signal at first carries out the windowing computing through the frequency hopping synchronization windowing submodule in the frequency domain immunity module after the filtering; By the frequency hopping tracking module auxiliary choose frequency hopping along after one piece of data carry out windowing, avoid window function and be added in and crossed over the one piece of data of frequency hopping along front and back, window function is selected the hamming window for use; Window width is chosen for N=Th * Fs/K; The K here is a natural number, and Th is the residence time of single-hop in the frequency hopping pattern, and Fs is the AD sample rate of receiver; Signal after the windowing transforms to frequency domain through the FFT transformation submodule; Through disturb suppressing processing sub interference signal is suppressed to handle again: the computing of averaging of N energy values of each Frequency point signal of representative of FFT transformation submodule output; Average multiply by a coefficient θ again and obtains threshold value, is the Frequency point energy value inhibition greater than the threshold value place in this N energy values zero; Signal after the inhibition is remapped through the IFFT transformation submodule on the time domain, obtains the output signal of frequency immunity module, and the output signal of this frequency immunity module flows to the ranging and range rate module again after demodulation module and despreading module.
2. directly expand the method for frequency hopping hybrid spread spectrum system frequency domain interference free performance by the described raising of claim 1; It is characterized in that; The frequency hopping tracking module produces the local Frequency Hopping Signal with the synchronous identical frequency hopping pattern of input signal, separates the mode hopping piece jumping is separated in the realization of multiplying each other of above-mentioned local Frequency Hopping Signal and input signal.
3. directly expand the method for frequency hopping hybrid spread spectrum system frequency domain interference free performance by the described raising of claim 2; It is characterized in that; When signal after the filtering carries out the windowing computing through the frequency hopping synchronization windowing submodule in the frequency domain immunity module; Window function is selected the hamming window for use; By the frequency hopping tracking module auxiliary choose add window position for from frequency hopping along beginning when the 600th data sample point finishes, it is 600 FFT conversion that the signal of FFT transformation submodule after to windowing done sequence length, is sequence length after the windowing that to be transformed into sequence length be 600 frequency-region signal for 600 time-domain signal; Disturb suppressing processing sub is that 600 frequency-region signal is averaged to the sequence length after the FFT conversion at first; Carrying out determining interference again handles: being judged to into interference signal and being suppressed greater than the frequency-region signal of 2 times of averages is zero, and the frequency-region signal that is not more than 2 times of averages is judged to signal and does not deal with; To the sequence length after disturb to suppress handling be 600 frequency-region signal to do sequence length be 600 IFFT conversion, obtain accomplishing the time-domain signal that disturbs after suppressing to handle after the conversion.
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| CN102752015B (en) * | 2012-07-09 | 2014-04-09 | 中国人民解放军国防科学技术大学 | Method for detecting and processing narrow-band interference of DS (Direct Sequence)/FH (Frequency Hopping) hybrid spread spectrum communication system |
| CN103237318B (en) * | 2013-03-21 | 2016-08-31 | 杭州华三通信技术有限公司 | The apparatus and method of data are read during a kind of spectrum analysis |
| CN104459733B (en) * | 2014-11-18 | 2017-01-18 | 中国电子科技集团公司第十研究所 | Method for improving GPS signal L1-P(Y) code tracking performance |
| CN104393891B (en) * | 2014-11-27 | 2017-05-10 | 电子科技大学 | Communication method for driving frequency spreading/frequency hopping of direct sequence by adopting information |
| CN106026973B (en) * | 2016-05-17 | 2019-02-05 | 中国电子科技集团公司第四十一研究所 | The average noise noise-reduction method that a kind of pair of FFT data is implemented |
| CN106374970B (en) * | 2016-11-05 | 2019-04-05 | 福建北峰通信科技股份有限公司 | A kind of device and method of million rank narrowband frequency hopping communications |
| CN110730018B (en) * | 2019-10-21 | 2021-07-02 | 电子科技大学 | Anti-interference method of direct-spread frequency hopping hybrid spread spectrum system |
| CN111431560B (en) * | 2020-03-25 | 2021-03-26 | 北京理工大学 | Anti-strong interference device and method based on IIR filter |
| CN114079527B (en) * | 2020-08-11 | 2024-04-05 | 上海交通大学 | Photon frequency hopping digital signal receiving method and device |
| CN112711045B (en) * | 2020-12-08 | 2023-11-21 | 和芯星通科技(北京)有限公司 | Method and device for processing interference in navigation signal |
| CN113507548A (en) * | 2021-07-09 | 2021-10-15 | 郑州琼佩电子技术有限公司 | Signal anti-interference system for image processing |
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| CN101610231B (en) * | 2008-06-18 | 2013-06-05 | 中兴通讯股份有限公司 | Method and device for realizing frequency hopping |
| CN101631102B (en) * | 2009-04-10 | 2011-09-21 | 北京理工大学 | Interference pattern recognition technology of frequency hopping system |
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